Apparatus for saving fuel.



No. IZ`3.4,626. PATENTED JULY 28, 1903.

Smm. APPARATHS Fon SAYING FUEL.

APPLIGATION FILED, .mlm 2. 1900. Mmmm mso. 30.190,2,

No MODEL.

Patented July as, 190e.

oYRUs sMITI-I, or IRWIN, PENNSYLVANIA.

APPARATUS FOR lSAVING `FU EL.

l SPECIFICATION forming part of Letters Patent No.- 734,626, dated July 28, 1903. Application filed July 2, 1900. RenewerlDecemjber 30, 1902. Serial No. 137.207. (No model.)

` To @ZZ whom t may concern:

`Be it known that I, CYRUs SMITH@ resident of Irwin, in the county of Westmoreland and State of Pennsylvania, have inventeda new and useful Improvement in Apparatus y for Saving Fuel; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an attachment for steam-boiler and other furnaces whereby the carbonio-acid gas and solid waste products of combustion are returned to the tire and more perfect combustion of the fuel secured and the efficiency of the furnace greatly increased. l

To enable others skilled in the artto make and use my invention, I will describe-the same more fully, referring to the accompanying drawings, in which--` Figure 1 is a vertical longitudinal section of a steam-boiler furnace with my attachment applied. Fig. 2 is -a longitudinal secvtion through the fan-casing and fan, and Fig.

34 is a transversesection of the same.

I have illustrated myinventionin connection with a verticalfboiler 1, although any other type of boiler might be used. The boiler is provided withthe usual furnacegrate 2, below which isthe ash-pit 3, said ashpit being provided with the usual doors, (notV shown,) through which the ashes are removed and which supply the draft for ,the furnace. The furnaceris further provided with a stack 4, which in the present instance has an enlarged portion 5, formed by a funnel-shaped being'connected at "the-other side with the pipe 6. Said casing at its lower side has an opening 11, communicating-with the pipe 12, which extends down and leads into the ashpit 3, as shown in Fig. 1. The fan comprises five or 'other suitable number of radial arms 13, secured to a hollow hub or sleeve 14, said hub orsleeve being bolted or otherwise suitably secured to a spider 15, secured to the .ably supported in proper relation to the `boiler and stack. The shaft 16 is provided "with a pulley 20, whereby the shaft may be jdriven from any suitable source of power, either the engine itself or a separate source. The shaft is furthermore provided With a watercooling box 21, which prevents the heat being communicated from the fan to the journal-boxes 17.

"Each of the wings 13 is made hollow, as shown in Figs. 2 and 3, the inner ends of the wings being flanged and suitably bolted or otherwise secured to the sleeve or hub 14, the latter being provided with openings 22, communicating with the interior of the wings. The wings are cut away at their inner front edges, as shown in Figs. 1 and 2, so that the base is substantially one-half the width of the upper ends thereof, and the opening at the inner end of said wings is somewhat smaller than the opening at the outer end thereof, thereby `permitting a free tiow of air through said wings. Between the` wings are crescentshaped defiector-plates 23, which are attached at their outer edges to the rear edges of the Wings and project forward in a downwardlyinclined direction and areconnected to the cone 24', secured to the front end of the sleeve or hub 14. The cone 24, together with the deliector-plates 23 and the cut-away portion at the base or inner front edges of the wings, provides for the free entrance of the waste products'of combustion into the fan-casing and directs the same in the proper course to be drawn therein and discharged into the pipe 12.

On the upper side of the pipe 6 isprovided a suitable opening 25,4 the bottom wall .26 of which slopes downward and leads toward the opening to the fan-casing. Asuitable cover or door 27 is hung at one edge to the pipe 6 and is provided with a ring 28, to which may be attached a cord or similar device for holding said door or valve open to any desired degree. The pipe 6 is provided with a damper or other suitable valve 29 and the pipe 12 with a similar valve 30.

The operation of the device is as follows: The furnace may be started by natural draft, the dampers 29 and 30 being closed meanwhile to prevent back draft. After sufiicient steam is generated to drive the fan 7 the damper 29 is opened Wide and the damper 30 opened as Wide as may be desired, the amou-nt of opening of the damper 30 regulating the amount of draft secured through the fan. The fan is then set in motion, and as the carbonio-acid gas, carbon, and other waste products of combustion are ponderable quantities they are drawn into the fan-casing and discharged through the pipe l2 into Ithe ash` pit 3 and directed into the re, the door leading to the ash-pit being meantime closed.

'The fan not only draws in the solid and heavy waste product-s of combustion through the pipe 6, but also draws in air through the opening 10, which passes through the hollow hub 14:- and the hollow wings 13. This air not only serves to keep the shaft 16 cool, but also aids in combustion in that it is mixed with the waste products of combustion and becomes heated thereby, thus acting as a hot blast for the fire. A further supply o'f air is drawn through the opening 25 in the pipe 6, the quantity whereof can be regulated by the door or valve 27.

It will be observed that the stack 4 is not provided with a damper, so that the natural draft is unobstructed, the fan serving merely to draw the more heavy waste products of combustion from the stack and return them to the furnace. The combustion of the fuel therefore is much more perfect than with the ordinary style of furnace, and at the same time the draft of the furnaceis in no manner obstructed.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a device of the class specified, the combination with the furnace, ash-pit and unobstructed stack, ofa fan, and casing therefor, pipes leading from the same tothe stack and ash-pit, respectively, and means in the stack for defiecting the solid and heavy Waste products of combustion into the pipe leading to the fan.

2. In a device of the class specified, the combination with the furnace, ash-pit and unobstructed stack, of a fan and casing therefor, pipes leading from the same to the stack and ash-pit respectively, and a stationary conical deliector in the stack opposite the pipe leading to the fan.

In a device of the character specified, the combination4 with the furnace, unobstructed stack and ash-pit, of a fan and casing therefor, pipes leading from the same to the stack and ash-pit respectively, said fan being provided with hollow wings communieating at their inner ends with the atmosphere and a valved opening in the pipe leading from the stack to the fan.

4. In a device of the character specified, the combination with the furnace, unobstructed stack and ash-pit, of a fan-casing, pipes leading from the same to the stack and ash-pit respectively, said casing being provided With an opening opposite the pipe leading to the stack, a valved opening in the pipe leading from the stack to the fan-casing, a fan in said casing and arranged to draw the products of combustion from the stack and having a hollow hub communicating with the opening in the casing and hollow wings communicating with the hollow hub and deflector-plates between the wings and sloping toward the pipe leading to the stack.

5. In a device of the character specified, the combination with the furnace, unobstructed stack and ash-pit, of a fan and casing therefor, pipes leading from the same to the stack and ash-pit respectively, said fan being provided with hollow wings having narrow bases communicating with the atmosphere and broad outer ends, delector-plates between the wings and sloping toward the pipe leading to the stack and a valved open- 'ing in the pipe leading from the stack to the fan.

In testimony whereof I, the said CYRUS SMITH, have hereunto set my hand.

CYRUS SMITH. Vitnesses:

D. M. THORNE, K. S. PERRY. 

